Tk Source Code

	    dlPtr->oldY = dlPtr->y;
	    if (dlPtr->nextPtr == dlPtr2) {
		break;
	    }
	    dlPtr = dlPtr->nextPtr;
	}

	/*
	 * Scan through the lines following the copied ones to see if we are
	 * going to overwrite them with the copy operation. If so, mark them
	 * for redisplay.
	 */

	for ( ; dlPtr2 != NULL; dlPtr2 = dlPtr2->nextPtr) {

	 * calling TextInvalidateRegion to mark the display blocks as stale.
	 */

	damageRgn = TkCreateRegion();
	if (TkScrollWindow(textPtr->tkwin, dInfoPtr->scrollGC, dInfoPtr->x,
		oldY, dInfoPtr->maxX-dInfoPtr->x, height, 0, y-oldY,
		damageRgn)) {

	    TextInvalidateRegion(textPtr, damageRgn);

	}
	numCopies++;
	TkDestroyRegion(damageRgn);
    }

    /*
     * Clear the REDRAW_PENDING flag here. This is actually pretty tricky. We

#ifndef TK_NO_DOUBLE_BUFFERING
		    Tk_FreePixmap(Tk_Display(textPtr->tkwin), pixmap);
#endif /* TK_NO_DOUBLE_BUFFERING */
		    return;
		}
		dlPtr->oldY = dlPtr->y;
		dlPtr->flags &= ~(NEW_LAYOUT | OLD_Y_INVALID);
#ifdef MAC_OSX_TK
	    } else if (dlPtr->chunkPtr != NULL) {
		/*
		 * On macOS we need to redisplay all embedded windows which
		 * were moved by the call to TkScrollWindows above.  This is
		 * not necessary on Unix or Windows because XScrollWindow will
		 * have included the bounding rectangles of all of these
		 * windows in the damage region.  The macosx implementation of
		 * TkScrollWindow does not do this.  It simply generates a
		 * damage region which is the scroll source rectangle minus
		 * the scroll destination rectangle.  This is because there is
		 * no efficient process available for iterating through the
		 * subwindows which meet the scrolled area.  (On Unix this is
		 * handled by GraphicsExpose events generated by XCopyArea and
		 * on Windows by ScrollWindowEx.  On macOS the low level
		 * scrolling is accomplished by calling [view scrollRect:by:].
		 * This method does not provide any damage information and, in
		 * any case, could not be aware of Tk windows which were not
		 * based on NSView objects.
		 *
		 * On the other hand, this loop is already iterating through
		 * all embedded windows which could possibly have been moved
		 * by the scrolling.  So it is as efficient to redisplay them
		 * here as it would have been if they had been redisplayed by
		 * the call to TextInvalidateRegion above.
		 */
#else
	    } else if (dlPtr->chunkPtr != NULL && ((dlPtr->y < 0)
		    || (dlPtr->y + dlPtr->height > dInfoPtr->maxY))) {


		/* 
		 * On platforms other than the Mac:
		 *
		 * It's the first or last DLine which are also overlapping the
		 * top or bottom of the window, but we decided above it wasn't
		 * necessary to display them (we were able to update them by
		 * scrolling). This is fine, except that if the lines contain
		 * any embedded windows, we must still call the display proc
		 * on them because they might need to be unmapped or they
		 * might need to be moved to reflect their new position.
		 * Otherwise, everything else moves, but the embedded window
		 * doesn't!
		 *
		 * So, we loop through all the chunks, calling the display
		 * proc of embedded windows only.
		 */
#endif
		register TkTextDispChunk *chunkPtr;

		for (chunkPtr = dlPtr->chunkPtr; (chunkPtr != NULL);
			chunkPtr = chunkPtr->nextPtr) {
		    int x;
		    if (chunkPtr->displayProc != TkTextEmbWinDisplayProc) {
			continue;
		    }

			 * as being off-screen to the left (the displayProc
			 * may not be able to tell if something is off to the
			 * right).
			 */

			x = -chunkPtr->width;
		    }
		    if (tkTextDebug) {
			char string[TK_POS_CHARS];

			TkTextPrintIndex(textPtr, &dlPtr->index, string);
			LOG("tk_textEmbWinDisplay", string);
		    }
		    TkTextEmbWinDisplayProc(textPtr, chunkPtr, x,
			    dlPtr->spaceAbove,
			    dlPtr->height-dlPtr->spaceAbove-dlPtr->spaceBelow,
			    dlPtr->baseline - dlPtr->spaceAbove, NULL,
			    (Drawable) None, dlPtr->y + dlPtr->spaceAbove);
		}

	    }
	}
#ifndef TK_NO_DOUBLE_BUFFERING
	Tk_FreePixmap(Tk_Display(textPtr->tkwin), pixmap);
#endif /* TK_NO_DOUBLE_BUFFERING */
    }

$t insert end "You can also create multiple text widgets each of which "
$t insert end "display the same underlying text. Click this button to "
$t window create end \
  -create {button %W.peer -text "Make A Peer" -command "textMakePeer %W" \
  -cursor top_left_arrow} -padx 3
$t insert end " widget.  Notice how peer widgets can have different "
$t insert end "font settings, and by default contain all the images "
$t insert end "of the 'parent', but that the embedded windows, "
$t insert end "such as buttons may not appear in the peer.  To ensure "
$t insert end "that embedded windows appear in all peers you can set the "
$t insert end "'-create' option to a script or a string containing %W.  "
$t insert end "(The plot above and the 'Make A Peer' button are "
$t insert end "designed to show up in all peers.)  A good use of "
$t insert end "peers is for "
$t window create end \
  -create {button %W.split -text "Split Windows" -command "textSplitWindow %W" \
  -cursor top_left_arrow} -padx 3
$t insert end " \n\n"

$t insert end "Users of previous versions of Tk will also be interested "

$t insert end "text widget (\"Default\" restores the color to "
$t insert end "its default).  If you click on the button labeled "
$t insert end "\"Short\", it changes to a longer string so that "
$t insert end "you can see how the text widget automatically "
$t insert end "changes the layout.  Click on the button again "
$t insert end "to restore the short string.\n"

$t insert end "\nNOTE: these buttons will not appear in peers!\n" "peer_warning"
button $t.default -text Default -command "embDefBg $t" \
	-cursor top_left_arrow
$t window create end -window $t.default -padx 3
global embToggle
set embToggle Short
checkbutton $t.toggle -textvariable embToggle -indicatoron 0 \
	-variable embToggle -onvalue "A much longer string" \

$t window create end -window $t.bigP
$t window create end -window $t.smallP

$t insert end "\n\nFinally, images fit comfortably in text widgets too:"

$t image create end -image \
    [image create photo -file [file join $tk_demoDirectory images ouster.png]]


proc textWindBigB w {
    $w configure -borderwidth 15
}

proc textWindBigH w {
    $w configure -highlightthickness 15

    set n 1
    while {[winfo exists .peer$n]} { incr n }
    set w [toplevel .peer$n]
    wm title $w "Text Peer #$n"
    frame $w.f -highlightthickness 1 -borderwidth 1 -relief sunken
    set t [$parent peer create $w.f.text -yscrollcommand "$w.scroll set" \
	       -borderwidth 0 -highlightthickness 0]
    $t tag configure peer_warning -font boldFont
    pack $t -expand  yes -fill both
    ttk::scrollbar $w.scroll -command "$t yview"
    pack $w.scroll -side right -fill y
    pack $w.f -expand yes -fill both
}

proc textSplitWindow {textW} {
    if {$textW eq ".twind.f.text"} {
	if {[winfo exists .twind.peer]} {
	    destroy .twind.peer
	} else {
	    set parent [winfo parent $textW]
	    set w [winfo parent $parent]
	    set t [$textW peer create $w.peer \
	      -yscrollcommand "$w.scroll set"]
	    $t tag configure peer_warning -font boldFont
	    $w.pane add $t
	}
    } else {
        return
    }
}

Tcl/Tk macOS README
----------------------

This is the README file for the macOS/Darwin version of Tcl/Tk.

1. Where to go for support
--------------------------

- The tcl-mac mailing list on sourceforge is the best place to ask questions
specific to Tcl & Tk on macOS:
	http://lists.sourceforge.net/lists/listinfo/tcl-mac
(this page also has a link to searchable archives of the list, please check them
before asking on the list, many questions have already been answered).

- For general Tcl/Tk questions, the newsgroup comp.lang.tcl is your best bet:
	http://groups.google.com/group/comp.lang.tcl/

- The Tcl'ers Wiki also has many pages dealing with Tcl & Tk on macOS, see
	http://wiki.tcl.tk/_/ref?N=3753
	http://wiki.tcl.tk/_/ref?N=8361

- Please report bugs with Tk on macOS to the tracker:
	http://core.tcl.tk/tk/reportlist

2. Using Tcl/Tk on macOS
---------------------------

- There are two versions of Tk available on macOS: TkAqua using the native
aqua widgets and look&feel, and TkX11 using the traditional unix X11 wigets.
TkX11 requires an X11 server to be installed, such as Apple's X11 (which is
available as an optional or default install on recent macOS).
TkAqua and TkX11 can be distinguished at runtime via [tk windowingsystem].

- At a minimum, macOS 10.3 is required to run Tcl and TkX11.
TkAqua requires macOS 10.5 or later (starting with the Cocoa-based Tk 8.5.7).

- Unless weak-linking is used, Tcl/Tk built on macOS 10.x will not run on
10.y with y < x; on the other hand Tcl/Tk built on 10.y will always run on 10.x
with y <= x (but without any of the fixes and optimizations that would be
available in a binary built on 10.x).
Weak-linking is available on OS X 10.2 or later, it additionally allows Tcl/Tk
built on 10.x to run on any 10.y with x > y >= z (for a chosen z >= 2).

- Wish checks the Resources/Scripts directory in its application bundle for a

$pkg/Resources/Scripts/pkgIndex.tcl as well as the usual $pkg/pkgIndex.tcl.
This allows building extensions as frameworks with all script files contained in
the Resources/Scripts directory of the framework.

- [load]able binary extensions can linked as either ordinary shared libraries
(.dylib) or as MachO bundles (since 8.4.10/8.5a3); bundles have the advantage
that they are [load]ed more efficiently from a tcl VFS (no temporary copy to the
native filesystem required), and prior to macOS 10.5, only bundles can be
[unload]ed.

- The 'deploy' target of macosx/GNUmakefile installs the html manpages into the
standard documentation location in the Tcl/Tk frameworks:
	Tcl.framework/Resources/Documentation/Reference/Tcl
	Tk.framework/Resources/Documentation/Reference/Tk
No nroff manpages are installed by default by the GNUmakefile.

application's Info.plist (or displaying an alert if no Help Book is set). This
action can be customized by defining a procedure named [tk::mac::ShowHelp], if
present, this procedure is invoked instead by the standard Help menu item.
Support for the Window menu and [tk::mac::ShowHelp] was added with the
Cocoa-based Tk 8.5.7.

- The TkAqua-specific command [tk::unsupported::MacWindowStyle style] is used to
get and set macOS-specific toplevel window class and attributes. Note that
the window class and many attributes have to be set before the window is first
mapped for the change to have any effect.
The command has the following syntax:
	tk::unsupported::MacWindowStyle style window ?class? ?attributes?
The 2 argument form returns a list of the current class and attributes for the
given window. The 3 argument form sets the class for the given window using the
default attributes for that class. The 4 argument form sets the class and the

magenta	#ff00ff
orange	#ff8000
purple 	#800080
brown	#996633
clear	systemTransparent

- The Cocoa-based TkAqua can be distinguished from the older Carbon-based
version via the [winfo server .] command, example output on macOS 10.5.7:
    Cocoa-based:	CG409.3 Apple AppKit GC 949.46 macOS 1057
    Carbon-based:	QD10R30 Apple 1057

- If you want to use Remote Debugging with Xcode, you need to set the
environment variable XCNOSTDIN to 1 in the Executable editor for Wish. That will
cause us to force closing stdin & stdout.  Otherwise, given how Xcode launches
Wish remotely, they will be left open and then Wish & gdb will fight for stdin.


3. Building Tcl/Tk on macOS
------------------------------

- At least macOS 10.3 is required to build Tcl and TkX11, and macOS 10.5
is required to build TkAqua.
Apple's Xcode Developer Tools need to be installed (only the most recent version
matching your OS release is supported), the Xcode installer is available on Mac
OS X install media or may be present in /Applications/Installers on Macs that
came with OS X preinstalled. The most recent version can always be downloaded
from the ADC website http://connect.apple.com (free ADC membership required).

- Tcl/Tk are most easily built as macOS frameworks via GNUmakefile in
tcl/macosx and tk/macosx (see below for details), but can also be built with the
standard unix configure and make buildsystem in tcl/unix resp. tk/unix as on any
other unix platform (indeed, the GNUmakefiles are just wrappers around the unix
buildsystem).
The macOS specific configure flags are --enable-aqua, --enable-framework and
--disable-corefoundation (which disables CF and notably reverts to the standard
select based notifier). Note that --enable-aqua is incompatible with
--disable-corefoundation (for both Tcl and Tk configure).

- It is also possible to build with the Xcode IDE via the projects in
tk/macosx, take care to use the project matching your DevTools and OS version:
	Tk.xcode: 		    for Xcode 3.1 on 10.5

directories are named differently, e.g. '../../tcl8.6' and '../../tk8.6', you
need to manually change the TCL_SRCROOT and TK_SRCROOT settings by editing your
${USER}.pbxuser file (located inside the Tk.xcodeproj bundle directory) with a
text editor.

- To build universal binaries outside of the Xcode IDE, set CFLAGS as follows:
	export CFLAGS="-arch i386 -arch x86_64 -arch ppc"
This requires macOS 10.4 and Xcode 2.4 (or Xcode 2.2 if -arch x86_64 is
omitted, but _not_ Xcode 2.1) and will work on any architecture (on PowerPC
Tiger you need to add "-isysroot /Developer/SDKs/MacOSX10.4u.sdk").
Note that configure requires CFLAGS to contain a least one architecture that can
be run on the build machine (i.e. ppc on G3/G4, ppc or ppc64 on G5, ppc or i386
on Core and ppc, i386 or x86_64 on Core2/Xeon).
Universal builds of Tcl TEA extensions are also possible with CFLAGS set as
above, they will be [load]able by universal as well as thin binaries of Tcl.

make overrides to the tk/macosx GNUmakefile, e.g.
	make -C tk${ver}/macosx \
	    TCL_FRAMEWORK_DIR=$HOME/Library/Frameworks TCLSH_DIR=$HOME/usr/bin
	sudo make -C tk${ver}/macosx install \
	    TCL_FRAMEWORK_DIR=$HOME/Library/Frameworks TCLSH_DIR=$HOME/usr/bin
The Makefile variables TCL_FRAMEWORK_DIR and TCLSH_DIR were added with Tk 8.4.3.

4. Details regarding the macOS port of Tk.
-------------------------------------------
 
4.1 About the event loop
~~~~~~~~~~~~~~~~~~~~~~~~

The main program in a typical OSX application looks like this (see
https://developer.apple.com/library/mac/documentation/Cocoa/\
Reference/ApplicationKit/Classes/NSApplication_Class)

    void NSApplicationMain(int argc, char *argv[]) {
        [NSApplication sharedApplication];
        [NSBundle loadNibNamed:@"myMain" owner:NSApp];
        [NSApp run];
    }
Here NSApp is a standard global variable, initialized by the OS, which
points to an object in a subclass of NSApplication (called
TKApplication in the case of the macOS port of Tk).

The [NSApp run] method implements the event loop for a typical Mac
application.  There are three key steps in the run method.  First it
calls [NSApp finishLaunching], which creates the bouncing application
icon and does other mysterious things. Second it creates an
NSAutoreleasePool.  Third, it starts an event loop which drains the
NSAutoreleasePool every time the queue is empty, and replaces the
drained pool with a new one.  This third step is essential to
preventing memory leaks, since the internal methods of Appkit objects
all assume that an autorelease pool is in scope and will be drained
when the event processing cycle ends.

The macOS Tk application does not call the [NSApp run] method at
all.  Instead it uses the event loop built in to Tk.  So the
application must take care to replicate the important features of the
method ourselves.  The way that autorelease pools are handled is
discussed in 4.2 below.  Here we discuss the event handling itself.

The Tcl event loop simply consists of repeated calls to TclDoOneEvent.
Each call to TclDoOneEvent begins by collecting all pending events from
an "event source", converting them to Tcl events and adding them
to the Tcl event queue. For macOS, the event source is the NSApp
object, which maintains an event queue even though its run method
will never be called to process them.  The NSApp provides methods for
inspecting the queue and removing events from it as well as the
[NSApp sendevent] which sends an event to all of the application's
NSWindows which can then send it to subwindows, etc.

The event collection process consists of first calling a platform
specific SetupProc and then a platform specific CheckProc.  In
the macOS port, these are named TkMacOSXEventsSetupProc and
TkMacOSXEventsCheckProc.

It is important to understand that the Apple window manager does not
have the concept of an expose event.  Their replacement for an expose
event is to have the window manager call the [NSView drawRect] method
in any situation where an expose event for that NSView would be
generated in X11.  The [NSView drawRect] method is a no-op which is
expected to be overridden by any application.  In the case of Tcl, the
replacement [NSView drawRect] method creates a Tcl expose event
for each dirty rectangle of the NSView, and then adds the expose
event to the Tcl queue.


4.2 Autorelease pools
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

In order to carry out the job of managing autorelease pools, which
would normally be handled by the [NSApp run] method, a private
NSAUtoreleasePool* property is added to the TkApplication subclass of
NSApplication. The TkpInit function calls [NSApp _setup] which
initializes this property by creating an NSAutoreleasePool. A bit
later on, TkpInit calls [NSAPP _setupEventLoop] which in turn calls
the [NSApp finishLaunching] method.










Since the CheckProc function gets called for every Tk event, it is an
appropriate place to drain the main NSAutoreleasePool and replace it
with a new pool.  This is done by calling the method [NSApp
_resetAutoreleasePool], where _resetAutoreleasePool is a method which
we define for the subclass.  Unfortunately, by itself this is not
sufficient for safe memory managememt because, as was made painfully
evident with the release of OS X 10.13, it is possible for calls to
TclDoOneEvent, and hence to CheckProc, to be nested.  Draining the
autorelease pool in a nested call leads to crashes as objects in use
by the outer call can get freed by the inner call and then reused later.
One particular situation where this happens is when a modal dialogue
gets posted by a Tk Application.  To address this, the NSApp object
also implements a semaphore to prevent draining the autorelease pool
in nested calls to CheckProc.

One additional minor caveat for developers is that there are several
steps of the Tk initialization which precede the call to TkpInit.
Notably, the font package is initialized first.  Since there is no
NSAUtoreleasePool in scope prior to calling TkpInit, the functions
called in these preliminary stages need to create and drain their own
NSAutoreleasePools whenever they call methods of Appkit objects
(e.g. NSFont).

4.3 Clipping regions and "ghost windows"
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Another unusual aspect of the macOS port is its use of clipping
regions.  It was part of Daniel Steffen's original design that the
TkWindowPrivate struct maintains three HIShapeRef regions, named
visRgn, aboveVisRgn and drawRgn.  These regions are used as clipping
masks whenever drawing into an NSView.  The visRgn is the bounding box
of the window with a rectangle removed for each subwindow and for each
sibling window at a higher stacking level.  The drawRgn is the
intersection of the visRgn with the clipping rectangle of the
window. (Normally, the clipping rectangle is the same as the bounding
rectangle, but drawing can be clipped to a smaller rectangle by
calling TkpClipDrawableToRect.) The aboveVisRgn is the intersection of
the window's bounding rectangle with the bounding rectangle of the
parent window.  Much of the code in tkMacOSXSubindows.c is devoted to
rebuilding these clipping regions whenever something changes in the
layout of the windows.  This turns out to be a tricky thing to do and
it is extremely prone to errors which can be difficult to trace.

It is not entirely clear what the original reason for using these
clipping regions was.  But one benefit is that if they are correctly
maintained then it allows windows to be drawn in any order.  You do
not have to draw them in the order of the window hierarchy.  Each
window can draw its entire rectangle through its own mask and never
have to worry about drawing in the wrong place.  It is likely that
the need for using clipping regions arose because, as Apple explicitly
states in the documentation for [NSView subviews],

    "The order of the subviews may be considered as being
    back-to-front, but this does not imply invalidation and drawing
    behavior."

In the early versions of the macOS port, buttons were implemented as
subviews of class TkButton.  This probably exacerbated the likelihood
that Tk windows would need to be drawn in arbitrary order.

The most obvious side effect caused by not maintaining the clipping
regions is the appearance of so-called "ghost windows".  A common
situation where these may arise is when a window containing buttons
is being scrolled.  A user may see two images of the same button on
the screen, one in the pre-scroll location and one in the post-scroll
location.

To see how these 'ghost windows' can arise, think about what happens if
the clipping regions are not maintained correctly.  A window might
have a rectangle missing from its clipping region because that
rectangle is the bounding rectangle for a subwindow, say a button.
The parent should not draw in the missing rectangle since doing so
would trash the button.  The button is responsible for drawing
there. Now imagine that the button gets moved, say by a scroll, but
the missing rectangle in the parent's clipping region does not get
moved correctly, or it gets moved later on, after the parent has
redrawn itself.  The parent would still not be allowed to draw in the
old rectangle, so the user would continue to see the image of the
button in its old location, as well as another image in the new
location.  This is a prototypical example of a "ghost window".
Anytime you see a "ghost window", you should suspect problems with the
updates to the clipping region visRgn.  It is natural to look for
timing issues, race conditions, or other "event loop problems".  But
in fact, the whole design of the code is to make those timing issues
irrelevant.  As long as the clipping regions are correctly maintained
the timing does not matter.  And if they are not correctly maintained
then you will see "ghost windows".

It is worth including a detailed description of one specific place
where the failure to correctly maintain clipping regions caused "ghost
window" artifacts that plagued the macOS port for years.  These
occurred when scrolling a Text widget which contained embedded
subwindows.  It involved some specific differences between the
low-level behavior of Apple's window manager versus those of the other
platforms, and the fix ultimately required changes in the generic Tk
implementation (documented in the comments in the DisplayText
function).

The Text widget attempts to improve perfomance when scrolling by
minimizing the number of text lines which need to be redisplayed.  It
does this by calling the platform-specific TkScrollWindow function
which uses a low-level routine to map one rectangle of the window to
another.  The TkScrollWindow function returns a damage region which is
then used by the Text widget's DisplayText function to determine which
text lines need to be redrawn.  On the unix and win platforms, this
damage region includes bounding rectangles for all embedded windows
inside the Text widget.  The way that this works is system dependent.
On unix, the low level scrolling is done by XCopyRegion, which
generates a GraphicsExpose event for each embedded window.  These
GraphicsExposed events are processsed within TkScrollWindow, using a
special handler which adds the bounding rectangle of each subwindow to
the damage region.  On the win platform the damage region is built by
the low level function ScrollWindowEx, and it also includes bounding
rectangles for all embedded windows.  This is possible because on X11
and Windows every Tk widget is also known to the window manager as a
window.  The situation is different on macOS.  The underlying object
for a top level window on macOS is the NSView.  However, Apple
explicitly warns in its documentation that performance degradation
occurs when an NSView has more than about 100 subviews.  A Text widget
with thousands of lines of text could easily contain more than 100
embedded windows.  In fact, while the original Cocoa port of Tk did
use the NSButton object, which is derived from NSView, as the basis
for its Tk Buttons, that was changed in order to improve performance.
Moreover, the low level routine used for scrolling on macOS, namely
[NSView scrollrect:by], does not provide any damage information.  So
TkScrollWindow needs to work differently on macOS.  Since it would be
inefficient to iterate through all embedded windows in a Text widget,
looking for those which meet the scrolling area, the damage region
constructed by TkScrollWindow contains only the difference between the
source and destination rectangles for the scrolling.  The embedded
windows are redrawn within the DisplayText function by some
conditional code which is only used for macOS.

	    /* Compute the damage. */
  	    dmgRgn = HIShapeCreateMutableWithRect(&srcRect);
 	    extraRgn = HIShapeCreateWithRect(&dstRect);
 	    ChkErr(HIShapeDifference, dmgRgn, extraRgn, (HIMutableShapeRef) dmgRgn);
	    result = HIShapeIsEmpty(dmgRgn) ? 0 : 1;

	    /* Convert to Tk coordinates, offset by the window origin. */
	    TkMacOSXSetWithNativeRegion(damageRgn, dmgRgn);

	    if (extraRgn) {
		CFRelease(extraRgn);
	    }

 	    /* Scroll the rectangle. */
 	    [view scrollRect:scrollSrc by:NSMakeSize(dx, -dy)];


























  	}
    } else {
	dmgRgn = HIShapeCreateEmpty();
	TkMacOSXSetWithNativeRegion(damageRgn, dmgRgn);
    }

    if (dmgRgn) {

@interface TKContentView(TKKeyEvent)
- (void) deleteWorkingText;
@end

@interface TKContentView(TKWindowEvent)
- (void) drawRect: (NSRect) rect;
- (void) generateExposeEvents: (HIShapeRef) shape;

- (void) viewDidEndLiveResize;
- (void) tkToolbarButton: (id) sender;
- (BOOL) isOpaque;
- (BOOL) wantsDefaultClipping;
- (BOOL) acceptsFirstResponder;
- (void) keyDown: (NSEvent *) theEvent;
@end

    event.xany.display = Tk_Display(winPtr);
    event.type = Expose;
    event.xexpose.x = damageBounds.origin.x - bounds.origin.x;
    event.xexpose.y = damageBounds.origin.y - bounds.origin.y;
    event.xexpose.width = damageBounds.size.width;
    event.xexpose.height = damageBounds.size.height;
    event.xexpose.count = 0;
    Tk_QueueWindowEvent(&event, TCL_QUEUE_TAIL);

#ifdef TK_MAC_DEBUG_DRAWING
    NSLog(@"Expose %p {{%d, %d}, {%d, %d}}", event.xany.window, event.xexpose.x,
	event.xexpose.y, event.xexpose.width, event.xexpose.height);
#endif

    /*

/* Core method of this class: generates expose events for redrawing.  If the
 * Tcl_ServiceMode is set to TCL_SERVICE_ALL then the expose events will be
 * immediately removed from the Tcl event loop and processed.  Typically, they
 * should be queued, however.
 */
- (void) generateExposeEvents: (HIShapeRef) shape
{







    unsigned long serial;
    CGRect updateBounds;
    int updatesNeeded;
    TkWindow *winPtr = TkMacOSXGetTkWindow([self window]);

    if (!winPtr) {
		return;
    }

    /* Generate Tk Expose events. */
    HIShapeGetBounds(shape, &updateBounds);

    set scrollInfo unchanged
    .t insert end xxxxxxxxx\n
    .t insert end xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx\n
    .t insert end xxxxxxxxxxxxxxxxxxxxxxxxxx
    update
    set scrollInfo
} [list 0.0 [expr {4.0/11}]]
test textDisp-6.10 {DisplayText, redisplay embedded windows after scroll.} {aqua} {
    .t configure -wrap char
    .t delete 1.0 end
    .t insert 1.0 "Line 1"
    foreach i {2 3 4} {
	.t insert end "\nLine $i"
    }
    .t insert end "\n"
    .t window create end -create {
	button %W.button_one -text "Button 1"}
    .t insert end "\nLine 6\n"
    .t window create end -create {
	button %W.button_two -text "Button 2"}
    .t insert end "\nLine 8\n"
    .t window create end -create {
	button %W.button_three -text "Button 3"}
    update
    .t delete 2.0 3.0
    update
    list $tk_textEmbWinDisplay
} {{4.0 6.0}}


# The following group of tests is marked non-portable because
# they result in a lot of extra redisplay under Ultrix.  I don't
# know why this is so.

.t configure -bd 2 -relief raised -wrap char
.t delete 1.0 end